Tool for boring conical holes



2 Sheets-Sheet 1.

(No Model.)

L. F. C. RICH. TOOL FOR BORING OONIOAL HOLES.

6 nw N Patented June 7 1898.

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WnNEssEs (No Model.) l 2 sheets-,-sneet 2. L. I'. C. RICH. -TO0L FOR BORING GONIOL HOLES.

Patented June 7,1898.

PATENT Crricn.

LOUIS FREDERICK CHARLES RICH, CHELTENI-IAM, ENGLAND, ASSIGNCR TO HIMSELF, AND JOI-IN HENRYI-IULL, OF NEW YORK, N. Y.

TOOL FOR BORlN OONIOAL HOLES.

SPECIFICATION forming part of Letters Patent No. 605,259, dated June 7, 1898. Appnmion nea september 27,1897. s511451 No. 653,110. (No 11161191.)

,To all whom, it may concern):

Be it known that I, LOUIS FREDERICK CHARLES RICH, a subject of the Queen of Great Britain and Ireland, residing at Cheltenham, in the county of Gloucester, England, have invented Improvements in Tools for Boring Conical Holes in Metal, Wood, and other Materials, of which the following isr a specifi-i improvements in angers of thekind referred,

to, as I shall now proceed to explain with the aid of the accompanying drawings, wherein- Figure 1 shows a piece of wood or other Ina-y terial in which are bored cylindrical holes, the inner ends of which it is desired to enlarge. Fig. 2 shows, partly in side elevation and partly in section, one construction of my improved auger specially suitable for use in enlarging holes in metal. Fig. 3 is a crosssection on the line'w w of Fig. 2. Figs. 2a, 4, 5, and 6 are detail views hereinafter more particularly referred to. elevations at right angles to each other, showing a modified construction of auger adapted` for use with wood and like material;` and' Figs. 9 and 10 are cross-sections thereof on the lines :n Qc and y y,.respectively, of Fig. 8. Figs. 11 and 12 are elevations at right angles to each other, the latter partly in section, showing a further modified construction of auger suitable for use with Wood and like material.l Figs. 13 to 17 are detail views thereof, hereinafter more particularly referred to.

Fig. 1 shows cylindrical holes 1 in a piece of wood or other material 2, and at 12M is shown how `the inner ends of such holes are to be enlarged by the cutters 3, Fig. 2, which are caused to travel over the inclined ways 4,` forming the bottom of recesses 4,cut in a Figs. 7 and 8 are` pin 8, and the spring bears with oneend yagainst a plug 7, screwed into the end of the tube 7, and with the other end against the spindle 9, which carries the guide-piece 5. The spring G, which loosely surrounds a spindle 7b on the plug 7', has a constant tendency to press the tube 7 'upward on the spindle 9. This spindle 9, which may be made in one with the guide-piece, as shown in Figs. 2 and 3, or have separate guide-pieces attached to it, is heldin the tube 7 by a screw 9a, which abuts against a shoulder 7 in the tube when the spindle and tube are pressed fully apart.V .To enable the cutters 3 to be quickly removed for sharpening, each of them is provided at itsupper end with an open slot3, (see Figs. 4 and 5,) by means' of which they can be simply hooled onto the pivot-pins 8 of the tube 7. Blade-springs 10 press the cutters 3 against the inclined surfaces 4. These springs are provided with two slots 1()a and 10b, Fig. 6, through which pass the screws 10c and 10d. The upper slot 10a is short and open, so that upon loosening the screws 10c .and 10d and drawing down the spring the slot 10 comes out of engagement with the screw 10C, and the blade-spring 10 can then be turned about the screw 10d so far that it no longer presses on its cutter 3. This cutter can then be easily removed from the pivot-pin 8.

To prevent the cutters 3 from being thrown outward by centrifugal force and consequently boring a larger hole than desired or injuring the widened hole, whichmight take place when the tool is driven at a high velocity, the sides of the recesses 4a in which the cutters Work may be undercut in dovetail fashion and the corresponding cutters. be guided in these undercuts.

To facilitate the escape of the shavings or IOO length that it abuts against the inner end 9a of the spindle 9 when the latter has ascended within the tube 7 to the distance that is to be cut by the cutters 3 when Within a hole 1,Fig 1.

It is also desirable thatthe normal position of the cutters 3 be capable of being altered in order to compensate for the wearing away of their cutting edges by use and sharpening. This adjustment is effected by means of the screw-plug 7 f, which can be screwed more or less into the upper end of the tube 7, whereby the distance between the inner end of the spindle 7b and the screw 9"L can be altered and the travel of the spindle 9 consequently regulated, and it is possible to push the cutters 3 forward when they are worn away. In order to enable the spring 6 to be more easily changed, it is loosely mounted on the spindle 7b, but its upper end is located in a groove 7 c of the spindle 7 b, in order to prevent the spring from falling olf the latter and to facilitate its removal.

Figs. 7 to 10, inclusive, show a modification of the auger in which the guide-piece 5 is flat and has inclined grooves 4 running on its opposite faces obliquely to its axis. The cutters 3 are thus caused to move outward as they descend and thereby widen the hole to a corresponding degree. The cutters are held in the grooves 4a by the undercut sides of the latter, Fig. 10. Instead of connecting the cutters 3 with the tube 7 by means of pins 8 (see Fig. 2) their upper ends 11 are in this case made hook-like and engage in slots 11iL of the tube 7 in such a manner that the cutters can move laterally. Tojenable the cut-- Figs. 11 and 12 show a modication in which a single cutter 3 is mounted in a groove 4, formed in a plate 12, which is shown separately in elevation in Fig.. 13 and as regards its upper part in section on the line 14 of Fig.

13 in Fig. 14. This plate 12 is so mounted on the guide-piece 5 (shown separately in elevation with its spindle 9 in Fig. 15) that it can be moved transversely thereon, so as to vary the initial distance of the cutter 3 from the axis of the tool to adapt the tool for widening holes of different diameters, and can be turned on the'guide-piece 5 in order to alter the an-v gle made by the groove 4 with the axis of the tool, so as to vary the conicity of the enlarged part 1a of a hole, Fig. 1. For these purposes the plate 12 is secured to the guide-piece 5 by set-screws 13 and 14, which pass through slots v15 and'l, respectively, in the guide-piece 5 and iit in screw-threaded holes in the plate 12, (see Fig. 12 and Fig. 16, which is a section on the line 16 of Fig. 11,) the heads of the setscrews 13 and 14 being received in suitable recesses made in the guide-piece 5. (See Fig. 12 and Vdotted lines in Fig. 15.) The irregular shape of the slot 16 is necessitated by the unequal adjustment allowed at the top and bottom of the guide-piecel 5. In the example shown the lateral adjustment allowed at the top is half that allowed at the bottom. The cutter 3 is connectedto the tube 7 by a cylindrical projection 3, which engages in a transverse groove 17 in the latter. is retained in place in the groove 4a in the example shown by a spring-nut 3", (see Fig. 12 and Fig. 17, which is a plan ofthe auger in verted,) that fits on a screw-threaded 'projection, (not shown,) extending from the cutter 3 through a slot4", made through the plate The cutter 3 12,and bears against the rear face of the guidebe provided with a hole 7c (see Figs. 11 and 12) to allow of the free egress of air when the spindle 9 ascends in the tube 7.

1. An auger comprising a spindle or rod provided near its lower end with a guide-surface or guide-surfaces inclined to the axisof the said spindle or rod, a tubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, a cutter or cutters attached to the lower end of the said holder, means for keeping the said cutter or cutters to the said guide-surface or guide-surfaces, and a spring adapted to force apart the upper ends of the said spindle or rod and the said holder, substantially as and for the purpose set forth.

2. An auger comprisingaspindle or rod provided near its lower end with a guide-'surface or guide-surfaces inclined to the axis of the said spindle or rod, a tubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, a cutter or cutters attached tothe lower end of the said holder, means for keeping the said cutter or cutters to the said guide-surface or guide-surfaces, a spring adapted to force apart the upholder, and means for limiting the downward movement of the said holder on the said spindle or rod, substantially as and for the purpose set forth'.

3. An auger comprising a spindle or rod provided near its lower end with a guide-surface or guide-surfaces inclined to the axis of the said spindle or rod, a tubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, a cutter or cutters attached to the lower end of the said holder, means for keeping the said cutter or cutters to the said guide-surface or guide-surfaces, a spring adapted to force apart the 11pper ends of the said spindle or rod and the said holder, and means for limiting the sepa- IOO IIO

per ends of the said spindle or rod and the said on the said spindle or rod and capable of be ing slid longitudinally thereon, a Icutter or cutters attached to the lower end of the said holder, means for keeping the said cutter or cutters to the said guide-surface or guide-sur faces, a spring adapted to force apart the upper ends of the said spindle or rod andthe 'said holder, and a screw inserted in the upper end of the said spindle or rod and having a head adapted to bear against a shoulder on the said holder, substantially as and for the purpose set forth.

5. An auger comprisinga spindle or rod provided near its lower end with a guide-surface or guide-surfaces inclined to the axis of the said spindle or rod, a tubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, a cutter or cutters attached to the lower end of the said holder, means for keeping the said cutter or cutters to the said guide-surface or guide-surfaces, a spring adapted to force apart the upper ends of the said spindle or rod and the said holder, and an adjustable stop for limiting the downward movement of the said holder on the said spindle or rod, substantially as and for the purpose set forth.

6.. An auger comprising a spindle or rod pro- 1 vided near its lower end with a guide-surface or guide-surfaces inclined to the axis of the said spindle or rod, a tubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, a cutter or cutters attached to the lower end of the said holder, means for keeping the'said cutter or cutters to the said guide-surface or guide-surfaces, a screw-.plug closing the upper end of the said holder, 'adjustable longitudinally therein, and carrying a downwardly-projecting spindle, and a spring surrounding the said downwardly-projecting spindle and pressing with its upper end against the said screwplug and with its lower end against the said spindle or rod, substantially as and for the purpose set forth.

7. An auger comprisinga spindle o r rod providednear its lower end with a guide-surface or guide-surfaces inclined to the axis of the said spindle or rod, a tubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, a cutter or cutters provided or each provided with a projection that engages in a transverse groove in the lower end of the said holder, and means for keeping the said cutter or cutters to the said guide-surface or guide-surfaces, substantially as and for the purpose set forth.

8. An auger comprising a spindle or rod, a

guide-surface near thelower end of the said spindle or rod and inclined to the axis vthereof, means for Varying the inclination of the said surface to the said axis, atubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, a cutter.A provided with a projection that engages in a transverse groove in the lower end of the said holder, and means for keeping the said cutter to the said guide-surface, substantially as and for the purpose set forth.

9. An auger comprising a spindle or rod, a guide-surface near the lower end of the said Vspindle or rod and inclinedto the axis thereof, means for varying the distanceof the up- `perend of the said guide-surface from the said axis, a tubularholder` mounted on the said spindle or rod and capable of being slid longitudinally thereon, a cutter provided with a projection that engages in a transverse groove in the lower end of the said holder, and means for keeping the said cutter to the said guide-surface, substantially as andv for the purpose set forth.

10. An auger comprising a spindle or rod, a guide-piece attached thereto near the lower end'thereof, a guide-plate which is provided with a guide-groove inclined to the axis of the said spindle or rod and is secured to the said guide-piece at its upper or lower end by means of a set-screw passing through a transverse slot in one of them and fitting a hole in the other, a tubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, and a cutter secured in the said guide-groove, capable of being slid longitudinally therein, and provided with a projection that engages in a transverse with a guide-groove inclined to the axis of the said spindle or rodand is secured at both ends to the said guide-piece by means of a set-screw passing through a transverse slot in one of them and fitting ahole in the other, a tubular holder mounted on the said spindle or rod and capable of being slid longitudinally thereon, and a cutter secured in the said guide-groove, capable of being slid longitudinally therein, and provided with aproje'ction that engages in a transverse groove in the lower end of the said holder, substantially as and for' the purpose set forth.

In testimony whereof I have signed my name to this specication in the presence of two subscribing witnesses.

LOUIS FREDERICK CHARLES RICH.

Witnesses:

GEORGE FREDERIGK4 LODDER, PERCY TALBOT CookLEmv IOO IIO 

